Dash-pot.



C* WALES.

DASH PUT,

APPLEOATION FILED 13.151,1913.

atented Nov. 3, 3193.4.

KNI/ENTOR WYTNESSES mii/W To all whom it vmay concern.'

Awith each other.

- ilmit PATJN CHARLES 'WALE OF NEW HAVEN', CONNECTICUT, SSGNOR TO THE WHITE EDING MACHINE COMPANY, 0F NEW HAVEN, CONNECTICUT, A CORP/Q'EATION OF CON NEC'I'ICUT.

DASH-POT.

i graces.

Specication of Letters Patent.

Patentes um. s, raie..

Be it known that l, CHARLES lVALns, a citizen ot the United States, residing at New .l-l'aven, in the county of New Haven and State ot Ctniuecticut, have invented a new and useful improvement in Dashflots, of which the following` is a. specification, reference being had to the accompanying drawing.

My improvement relates to such dashpots as are used in various mechanical apparatus for retarding motion of some part which is driven in one direction by gravity, manually or by mechanical power, the pur# pose being to insure such movement within a desired range of time, or to prevent shock.

The obj eet of my improvement is, by means other than piston rod paeliingvto provide a dash-potwhieh may turn from the uprig-D it. position without discharging Athe liquid used as a retarding medium, in order that the dash-pot may be adapted for use in such forms ot apparatus are portable and therefore liable to he turned 'from the upright position.

In the accompanying drawings, Figure l is an upright sectional elevation' of a dashpot embodying my improvement; Fig. 2 is a longitudinal section `ol the same dash-pot turned lengthwise into the horizontal position; Fig'. 3 is a section on the line 3 3, ot Fig'. l; Fog. l is a section on the line, 4 4, offFig. 2.

The apparatus comprises a chamber consisting` of a lower section, A, and an upper section, B, said two sections being` hermetically joined toeach other 'axially in line ln the particular form shown in the drawings, the upper section, l5, has` at its lower and upper end an outward directed i'iange, t, extending over the rim, D, of the section, A. Screws E, extend through said iiange into the section, A, to bind said sections together. To ,aidin inakin?,` a liquid-tight joint. a suitable washer. F, may be interiic'sed between said flange and said rim. And the internal diameter ot the section, B, is'prefcrably made less than the interior diameter of the section. A, in order that the piston (hereinafter described) may be confined l within the lower section and thereby have its upward movement limited.

In the head or top wall, G, of the upper section', i3, is a central' aperture, H. in said aperture is rigidly secured the upper end of considerable degree, eii'ectiife,

falling rod". J, extends loosely downward tlirougn the tube, l, into the lower chamber section, A, and there supports the piston. li. Three relatively narrow ribs, R, are formed on the interior of the tube at the outer end of the latter and parallel to the stem, J, to form a limited Contact area between said stein and said tube. A slee\"e ,fM, surrounds the stein, d', and has at its lower end' a hub. n. fitted to the stein and secured thereto by a cross pin, O. The portion of said sleeve above said hub has an interior diameter a little larger than the exterior diameter of the tube, I', and. said sleeve is long; enough to surround the lower portion of said tube.VV

From the foregoing it will be seen that `provision is made for the iii-cest movement oisaid stem through said tube, and the liquid. might pass between said tube and said stein, it said liquid were properly directed for such result. But this is` substantially avoided. Asv is usual, provision is made for the passing of the liquid around the piston (when the apparatus is in the up right position) to permit the retarded downward movement ot' the piston from its upper position. The quantity of the liquid is sutli cient to till the chamber almost to the rim of the lower section, A, as, for example, to the dotted lines, L, when the chamber is in the upright position. ,l'lhen during transpcrtation or storage the entire device is turned into thehorizontal position,` the liquid will extend into both sections of the chamber below the level of the tube, l, and sleeve, M, as indicated by Fie. 2.v And when the device is turned still further, so as to invert it, the liquid will occupy what is then the lower portion et' the chamber, around the tube, l'. The. lengthof said tube must be sullicient to extend above they upper surfaee of the liquid when the device is thus inverted.

In practice l have found that even without the sleeve M, such a daslifpot is, ito' a A 'torit he 'treely'turned into all positions without any real iowv of the liquid therefrom,- there in the formshown in the drawings, a-

ing, 'at the most, a discharge et' only a few a pocket for said liquid contents,

drops of the liquid through the tube, I, this being the result of oil splashing against the stem, J, andcreepingn alongr the latter when the apparatus is so turned as to bring the inner end olf the stem higher than its outer end. rlfhe sleeve', M, serves as a mask'or apron for/protecting .the portion of the stem immediately 'below'themtnbe, I, from oil which is splashed as above described. The oil splashes againstsaid sleeve and creeps along the latter and 'falls from the outer end thereof without reaching the stein.

For the assemblage or the parts, trie piston stem bearing' the sleeve, M, and piston, H, is out into position with reference to the upper chamber section, B. Then the lower chamber section, A, is applied to said upper section. by means of the screws, E, extending through the iangeC, of the upper section, B. For repair or renewal of the piston, or replenishing,` the liquid, said screws are withdrawn and the section lifted away from the section, A.

l claim as my invention:

l. ln a liquid dash pot the combination of a'chamber, piston therein, liquid' in which said piston mores when the dash 'pot is in operation, a tube extending downward.

into said chamber and haring a surface exposed to the liquid contents of said chamberl forming with the walls ot', said chamber a. pocket for said liquid contents, and ay piston stem extending through said tube and connected to said piston head.

2. In a liquid dash pot the combination of a chamber, a piston therein, a liquid in which said piston moves when the' dash pot is in operation, a lixed tube extendingr downward into said chamber and having a surface exposed to the liquid contents of said' chamber and forming with the walls of said chamber a pocket for said liquid contents, and a niston stem extending' through said tube and connected to said piston head, said tube extending into said chamber for a distance as great as the throw of said piston.

3. In a liquid dash p'ot the combination ot' a chamber, a piston therein, a liquid in which said piston moves when the dash pot is in operation, a i'ixed tube extending dowi'iward into said chamber and having,r surface exposed to the liquid contents of said chamber and formingwith the wills of said chamber and a piston stemextending through said tube and connected to said piston head, there being an air passage from the out-side to the inside of said chamber bounded on one side by the stem of said piston.

et. In a liquid dash pot the combination of a chamber, a piston therein, a liquid in which said piston moves when the dash pot is in operation, a fixed tube extending downward into said chamber and having a surface exposed to the liquid contents' of said chamber and Vlirming with the walls of said chamber a pocket for said liquid contents, a piston stem extending through said tube and connected to said piston head and a sleeve carried by said stein and loosely surrounding the lower end only of said tube when said piston is in depressed position, the other portion of said tube being then exposed to the iiuid in said chamber.

5. n a liquid dash pot the combination of a chamber, a piston therein, a liquid in which said piston moves when the dash pot is in operation, a fixed tube extending downwardy into' said chamber and having a surface exposed to the liquid contents of said chamber and forming with the walls of said chamber a pocket for .saidv liquid contents, a piston stein extending through said tube, and connected to said piston head, said tube extending into said chamber for a distance as great as the throw of said piston, and a sleeve carried by said stem and loosely surrounding` the lower end only of said tube when said piston is in depressed position, the other portion of said tube being then exposed to the fluid in said chamber. K

G. In a liquid dash pot. the combination ol' a chamber, a piston therein, a liquifd in which said piston moves when the dash pot is in operation, a fixed tubeextending,` downward into said chamber and having a surface cxposed to the liquid contents of said chamber and vforming with the walls oi' said chamber a pocket for said liquid contents, a piston stem extending through said tube and connected to said piston head ind a sleeve carried by said stem and loosely surrounding the lower end only of said tube when said pistonis in depressed position, the other portion of said tube being then exposed to the fluid in said chamber, there being an air passage from the outside to the inside of said chamber bounded on one side by the stein ol said piston.

in testimony whereof l have signed my naine, in prescnceof two witnesses, this 7th day of April, in the year one thousand nine hundred and thirteen. l CHARLES WALES Witnesses d. C. Nooowsnm EDWARD S. SWIFT. 

